Our fridge is often 75-95% full, and things I can picture this maybe being useful for - sour cream, pickles, condiments - are often pushed to the back or on the door. I have a hard time imagining anything besides mostly "oh look, the milk jug/large bowl of last night's leftovers is blocking the camera's view of this entire shelf".
It also doesn't solve the "is that sour cream at least 1/3 full?" or equally important "is it expired?" problem, which is almost worse, because seeing the sour cream container leads to a false positive, which means I don't buy more despite needing it.
This is me too (or more realistically, my fridge is 95-105% full) but there's definitely people out there whose fridges are usually mostly empty and a camera could reasonably capture everything in it.